/Engine/Plugins/VirtualProduction/LevelSnapshots/Source/LevelSnapshots/Public/Restorability/Params/ObjectSnapshotSerializationData.h
'Subobject' cannot be visible to standard Level Snapshots serialisation. A subobject is visible if it contained within a uproperty (object reference or collection of references) with the CPF_Edit flag. You can explicitly disallow uproperties using the Level Snapshots module.
int32 AddSubobjectSnapshot ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * Subobject )